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On_the_road

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  1. On_the_road's post in 2002 Signature front run bay fuse identification list? was marked as the answer   
    Here are some pictures from my 2002 Signature.

     


     

     

     

  2. On_the_road's post in Silverleaf TM-501 UBS JIB J1708/J1939 was marked as the answer   
    I used an Azulle Byte Plus Mini PC with a touch screen monitor.   I shoved the PC on the floor behind the driver seat.   I mounted the display on my dash next to my GPS.   You don't need the keyboard or mouse after you set it up.   Any Windows PC can run the Silverleaf software.
     
     
  3. On_the_road's post in Oil pressure gauge dead? was marked as the answer   
    I have decided to get to the bottom of the problem with my oil pressure gauge.   I cut it open using my lathe and a lathe bit ground very narrow.   I wanted to cut a very narrow groove almost all the way through, leaving just a thin section that I could easily break.

    Here is the result;

    The steel can just slides off;

     
    The meter is a moving iron movement.   That means that there are no hair springs like used in mechanical watches.   There are two coils that are wound at right angles from one another.   One coil is from the G (ground) terminal to the S (sensor) terminal and measures 175 ohms.   The other coil is from the I (12 volt) terminal to the S terminal and measures 71 ohms.   The movement is very rugged and cannot be damaged by applying 12 volts improperly.

    I tested the meter by connecting a potentiometer between S and G.   When I turned the potentiometer to 0 ohms, the pointer moved to 0 PSI.   When the potentiometer was set to 190 ohms, the meter went to 120 PSI.   Here, the potentiometer is set to 100 ohms.   Thus, my pressure meter is working correctly.

    I used aluminum foil tape to close the meter back up.   It will seal the casing against dust and should be thin enough to fit back in the dash.   If the tape does not work out, I will use glue.
    The original problem was that the meter was pegged at the maximum PSI.   It did not move with the key on or off.   The reason for this is in the nature of the meter movement.   Without a hair spring, there is nothing to move the pointer when the power is off, it stays in the last position   When the power is on, the pointer will peg due to the 12 volts unless a sensor is connected.   The normal range for the pressure sensor is 0 ohms to 190 ohms.   When the engine is stopped, there is no oil pressure and 0 ohms, so the pointer will move to 0 PSI.   Therefore, my problem is not with the meter.   Either the pressure sensor is bad or the wire going to the sensor is broken.   Now I will have to chase that down.
     
     
     
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